27821413 has 2 divisors, whose sum is σ = 27821414. Its totient is φ = 27821412.

The previous prime is 27821393. The next prime is 27821441. The reversal of 27821413 is 31412872.

It is an a-pointer prime, because the next prime (27821441) can be obtained adding 27821413 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 10029889 = 4218^2 + 3167^2 .

It is a cyclic number.

It is not a de Polignac number, because 27821413 - 2⁹ = 27820901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27821113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13910706 + 13910707.

It is an arithmetic number, because the mean of its divisors is an integer number (13910707).

Almost surely, 2^27821413 is an apocalyptic number.

It is an amenable number.

27821413 is a deficient number, since it is larger than the sum of its proper divisors (1).

27821413 is an equidigital number, since it uses as much as digits as its factorization.

27821413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 27821413 is about 5274.6007431843. The cubic root of 27821413 is about 303.0119300963.

The spelling of 27821413 in words is "twenty-seven million, eight hundred twenty-one thousand, four hundred thirteen".